Evaluate an insurance-linked securities (ILS) fund by looking through its label to the risks it actually transfers: which events can trigger losses, how much capital is exposed, how positions are valued and redeemed, and what fees reduce investor returns. Catastrophe bonds are the largest ILS category, but funds can also hold other insurance- and reinsurance-linked securities, so two funds called “ILS” may have materially different exposures.
What an ILS fund invests in—and how investors can lose money
Insurance-linked securities transfer specified insurance or reinsurance risks to capital-market investors. In a typical catastrophe-bond structure, an insurer or reinsurer transfers defined risks to a special-purpose vehicle (SPV). Investors provide capital by buying securities issued by the SPV, and collateral supports the protection provided to the insurer or reinsurer.
The security’s interest payments and return of principal depend on its terms. If the specified catastrophe event or loss trigger is met, investors may lose interest, principal, or both. If the covered loss does not reach the relevant terms, investors may receive interest and principal at maturity. That event-contingent payoff is the source of both the potential return and the possibility of a sudden loss. The National Association of Insurance Commissioners (NAIC) describes cat-bond payments as dependent on a defined catastrophe or an insurance loss exceeding a specified amount.
Catastrophe bonds commonly cover peak natural perils such as U.S. wind and earthquake, but issuance also includes severe convective storm and specialty risks. ILS can include non-catastrophe structures linked to mortality, longevity, or medical claim costs. Read the fund’s mandate and current holdings rather than assuming it is a pure catastrophe-bond strategy.
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How to judge a fund’s return claims
Separate security spreads from investor returns
A bond’s coupon or spread is not the same as an ILS fund’s expected net return. The spread is part of the compensation investors receive for accepting modeled event risk and other pricing factors. Fund results also reflect realized insurance losses, income earned on collateral, the portfolio mix, trading, valuation changes, and fund expenses.
Catastrophe bonds are often floating-rate, which can make them less sensitive to benchmark-rate changes than fixed-rate bonds. That feature does not remove catastrophe, credit, liquidity, or fund-level risks, and it does not establish what a particular fund will return.
Treat expected loss as a model estimate
Expected-loss figures are outputs of catastrophe models, not predictions that a particular loss will occur or a promise about returns. Ask who produced the model, what exposure data and assumptions were used, how uncertainty and secondary perils are handled, and how the manager adjusts position sizes when model estimates disagree. The available sources do not establish a single expected return or a reliable universal forecast for ILS funds.
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Check the market figures in context
Market issuance and spread data can help describe the market, but they are not fund-performance figures. The following statistics are attributed to the NAIC’s 2025 overview, which cites the Artemis Deal Directory where noted:
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| Measure | Reported figure | How to interpret it |
|---|---|---|
| Catastrophe bonds outstanding | Roughly $56.7 billion as of June 30, 2025 | Market size at that date, not the size or liquidity of any individual fund. |
| Issuance in the first half of 2025 | Approximately $17.6 billion | Issuance over that six-month period, not investment performance. |
| New risk in the second quarter of 2025 | About $10.5 billion across 38 transactions and 58 tranches | Quarterly issuance activity, as reported by the NAIC citing the Artemis Deal Directory. |
| Spread bands on second-quarter 2025 issuance | About 62% paid 5%–9%; about 21% paid 1%–5%; roughly 17% paid above 9% | Issuance spread bands, not fund returns, expected returns, or a forward estimate. |
In a July 2026 market update, Swiss Re described investor demand as robust, the pipeline as steady after record 2025 issuance, and catastrophe bonds as continuing to show low correlation with broader markets. That is Swiss Re’s market commentary; it is not a guarantee that every ILS fund will have low correlation or benefit a particular portfolio.
Evaluate the risks that determine the payoff
1. Trigger design, attachment and exhaustion
Find the exact event or loss measure that can impair the security. Identify the covered perils, the attachment point at which losses begin to affect investors, and the exhaustion point at which the protection is fully used. Check whether coverage is based on an individual occurrence or aggregate losses over a period. These terms determine how a catastrophe translates into an investor loss.
2. Basis risk and model uncertainty
A security’s trigger may not move in line with the sponsor’s actual losses. Parametric triggers use measured event characteristics; industry-loss triggers use an industry-wide loss measure; indemnity triggers are tied to the sponsor’s own losses under the contract. The trigger calculation, available exposure data, and model assumptions can all create uncertainty about whether a security pays when the sponsor suffers losses. GAO background material and the Standards Board for Alternative Investments (SBAI) identify these as due-diligence concerns.
3. Concentration across peril, region and time
Review exposures by peril, geography, sponsor, renewal period, and event season. A portfolio with many securities can still be concentrated if several respond to the same underlying catastrophe or share correlated exposures. Look through security count to the events that could impair multiple holdings together.
4. Collateral and counterparty dependencies
Check what collateral is held, who has custody, which investments are eligible, and whether the structure depends on counterparties. The NAIC notes historical collateral-credit losses associated with total return swap arrangements and says that structure is not used in outstanding catastrophe bonds described on its page. That statement should not be generalized to all ILS or all fund vehicles; inspect the specific fund and security documents.
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5. Liquidity, valuation and redemption terms
ILS positions may not trade continuously, especially when markets are thin or a major event is being assessed. Ask how the manager values hard-to-trade holdings, what sources or models inform valuations, and how prices are updated after an event. Compare those practices with the fund’s redemption frequency, notice requirements, lockups, gates, or other limits. An investor’s need for cash may arrive sooner than a fund can return it.
6. Fees, expenses and fund powers
Read the current offering documents for management fees, performance allocations, other expenses, turnover, and any permission to use leverage or borrow. These terms vary by fund. A quoted security spread or gross return does not account for the amount investors ultimately retain after fund-level costs.
7. Fit with the investor’s portfolio
Diversification is a possible portfolio outcome, not an inherent guarantee of the ILS label. Compare the fund’s actual exposures with the investor’s existing holdings, risk budget, time horizon, and ability to tolerate catastrophe-related losses. Test any low-correlation claim against the specific portfolio and period relevant to the decision rather than treating it as a fixed property.
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Compare candidate funds using the same questions
For a useful comparison, apply a consistent checklist to each fund’s current documents and manager reporting:
- Strategy and holdings: What share of the portfolio is in catastrophe bonds versus other insurance-linked risks?
- Risk transferred: Which perils, regions, sponsors, trigger types, attachment points, and exhaustion points are represented?
- Expected loss and uncertainty: Which model estimates are used, what assumptions drive them, and how are disagreements or secondary perils treated?
- Concentration: How much exposure can be affected by the same event, season, region, or sponsor?
- Collateral and counterparties: What collateral arrangements, custodians, eligible investments, or counterparty dependencies support the positions?
- Valuation and liquidity: How are less-liquid holdings marked, how often can investors redeem, and what notice, lockup, gate, or other restrictions apply?
- Costs and incentives: What management fee, performance allocation, and other expenses apply, and how do incentives align with investors?
- Loss history and reporting: How does the manager report event losses, valuation changes, and realized versus modeled outcomes?
- Portfolio fit: How does the fund’s actual exposure interact with the investor’s existing risks and cash needs?
SBAI’s 2025 guide announcement also highlights the choice between direct and fund access, liquidity, valuation, legal, tax and regulatory terms, fee alignment, and reporting templates. Those issues are especially important when comparing different ways to access ILS rather than comparing only headline spreads.
Use fund documents, not the asset-class label
Fund terms and eligible investors vary by vehicle and jurisdiction. Before investing, use the current prospectus or offering documents to confirm the portfolio mandate, fees, valuation policy, liquidity and redemption rules, and stated risks. Manager reporting should let you see what the fund owns and how exposures change; a broad strategy description alone cannot show whether the fund’s positions match your risk expectations.
The practical test is whether you can explain what events could cause losses, how those losses would reach the fund, whether you could access your money on the required timetable, and what remains after expenses. If those answers depend on assumptions you cannot assess, treat the uncertainty as part of the investment risk—not as evidence that the risk is absent.
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